Pregunta
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Find the -score corresponding to the given area. Round to two decimals, if necessary,
The area to the left of is .

The area to the right of is .
The area between and is .

Ask by Lindsey Williams. in the United States
Jan 21,2025

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Solución

Alright, I need to find the -scores corresponding to the given areas. Let’s tackle each part one by one.
First Problem:
  • Given: The area to the left of is .
  • To Find: The -score .
Since the area to the left of is , this means that is the 60th percentile in the standard normal distribution. To find the exact -score, I’ll use the standard normal distribution table or a calculator that provides the inverse cumulative distribution function.
Looking up in the standard normal distribution table:
  • The table typically provides the cumulative area from the left up to a certain -value.
  • For , the corresponding -score is approximately .
So, .
Second Problem:
  • Given: The area to the right of is .
  • To Find: The -score .
The area to the right of being implies that the area to the left of is (since the total area under the curve is ).
Using the standard normal distribution table:
  • corresponds to a -score of approximately .
Therefore, .
Third Problem:
  • Given: The area between and is .
  • To Find: The -score .
The area between and represents the central of the distribution. This means that of the data lies within standard deviations from the mean.
To find , I’ll use the property that the area between and is .
So, .
This simplifies to:
Looking up in the standard normal distribution table:
  • The corresponding -score is approximately .
Therefore, .
Summary of Findings:
  1. For the area to the left of being , .
  2. For the area to the right of being , .
  3. For the area between and being , .

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The Deep Dive

To find the -score corresponding to the area to the left of being , you can use standard normal distribution tables or a calculator. The area of implies that is the value where of the data lies to the left. Looking it up, the corresponding to is approximately .
Next, for the area to the right of being , that leaves to the left. Therefore, you are looking for where of the distribution falls to the left. From the standard normal distribution table, the corresponding to is approximately .
Lastly, for the area between and being , the area in the tails combined is (or in each tail). Therefore, you want to find the value where is to the left. Look it up, and you find the corresponding around .
So, the answers are:

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